Bose AV28 Процедура тестування - Сторінка 2
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AV28 Performance Verification Procedures
AM Performance Tests
AM Tuner General Test Setup
Setup a loop antenna as shown.
External AM
Loop Antenna
positioned inside
test loop antenna
Figure 1. AM Test Setup
1. AM Sensitivity Test
1.1 Set the RF generator output to 70 dBuV/M,
30% AM modulation, 400Hz and the unit and
RF generator to 1080 kHz.
1.2 Reference a dB meter to the left or right line
level output.
1.3 Turn off the RF generator's modulation.
1.4 The line level output should measure < -20
dB, SNR.
2. AM Stop Level Test
2.1 Set the RF generator to 1130 kHz, AM
modulation, 400 Hz modulation, 65 dBuV/M.
2.2 Place the unit into seek and verify the unit
stops at 1130 kHz.
2.3 Switch the RF generator for a 55 dbuV/M
field intensity and verify the unit does not stop
at 1130 kHz.
3. FM Sensitivity Test
3.1 Set the RF generator to 98.1 MHz, 1 kHz
mono modulation, pilot off, 75 kHz deviation, 46
dBuV/M at the unit's FM antenna input.
Test Loop
3.2 Measure the distortion at the left or right
line level output. It should be < 3.0%.
4. FM Stop Level Test
4.1 Set the RF generator to 98.9 MHz, 1 kHz
mono modulation, pilot off, 75 kHz deviation, 36
dBuV/M, at the unit's FM antenna input.
4.2 Place the unit into seek and verify that it
stops at 98.9 MHz.
4.3 Reduce the RF generator to 25 dBf.
4.4 Tune the unit to 98.1 MHz and then place
the unit into seek. Verify the radio does not stop
at 98.9 MHz.
5. Serial Data Verification
5.1 Connect an Oscilloscope to the serial data
output connector J704 pin 2.
5.2 Press volume up or down on the console.
Observe a digital wave form on the oscillo-
scope.
6. TV Sensor Verification
6.1 Apply a signal to the TV Sensor input J105
pin 2 at the level and frequency listed in the
following table. The signal should be applied to
the ring of a 3.5mm jack.
6.2 Measure the output of the detector, U303
pin 8, at J103 pin 19.
Note: Off <.8Vrms, On >2.5Vrms. Settling time
is .1 seconds to turn on, 2.0 seconds to turn
off.
Input
Frequency
Amplitude
60 Hz
200 mVrms
15.75 kHz
30 mVrms
31.5 kHz
30 mVrms
Note: If a unit fails any of these tests, refer to
the appropriate service manual for alignment
procedures. Replace any defective component
found.
2
Input
Detector
Output
<.8Vrms
>2.5 Vrms
>2.5Vrms